Word on the street is that Nathan, who underwent the surgery in April, surprised the crowd at London’s Wembley Stadium on Sunday where he appeared to sing his solo during “I Found You.” #EMOTIONAL. And naturally, close buds Siva and Nathan took to Instagram to mark the occasion. Siva captioned: “Good to have the boy back.” We agree! But maybe next time show us a few more of your pearly whites and a little less “deer in the headlights.” Then again, whatever, because can anyone say DUAL STRONG JAW LINES?